22115601666 has 64 divisors (see below), whose sum is σ = 51065251200. Its totient is φ = 7086195648.

The previous prime is 22115601661. The next prime is 22115601671. The reversal of 22115601666 is 66610651122.

It is an interprime number because it is at equal distance from previous prime (22115601661) and next prime (22115601671).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 22115601666.

It is not an unprimeable number, because it can be changed into a prime (22115601661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 324376 + ... + 386588.

It is an arithmetic number, because the mean of its divisors is an integer number (797894550).

Almost surely, 2^22115601666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22115601666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25532625600).

22115601666 is an abundant number, since it is smaller than the sum of its proper divisors (28949649534).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

22115601666 is a wasteful number, since it uses less digits than its factorization.

22115601666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62480 (or 62474 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The spelling of 22115601666 in words is "twenty-two billion, one hundred fifteen million, six hundred one thousand, six hundred sixty-six".